# Thermal Kit vs ChatPDF AI

The clearest difference is in-app purchases: Thermal Kit at none against ChatPDF AI's 3. Thermal Kit also leads on iOS requirement (14.0 vs 16.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ChatPDF AI sells 3 in-app purchases, starting at $2.99 per 7 days. Thermal Kit asks for nothing beyond the download.

Thermal Kit ships an update every 4 months, ChatPDF AI every 3 months. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Thermal Kit | ChatPDF AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Size | 53 MB | 32 MB |
| Requires iOS | **14.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [深圳市承恩热视科技有限公司](https://appshunter.io/developer/1700843354) | [Swifty Brains LLP](https://appshunter.io/developer/1844558566) |

## What reviewers say

### Thermal Kit

[App page](https://appshunter.io/ios/app/thermal-kit/id6504614889)

**Features:** macOS Compatibility

**In-app purchases:** none


### ChatPDF AI

[App page](https://appshunter.io/ios/app/chatpdf-ai-chat-pdf-summary/id6759276962)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChatPDF PREMIUM | $2.99 | per 7 days |
| ChatPDF PREMIUM | $6.99 | per month |
| ChatPDF AI Premium | $59.99 | per year |


## Frequently asked questions

### Is Thermal Kit free?

Thermal Kit is free to download, with no in-app purchases.

### Is ChatPDF AI free?

ChatPDF AI is free to download, with in-app purchases available.

### Do Thermal Kit or ChatPDF AI have ads?

Neither Thermal Kit nor ChatPDF AI shows ads.

### Which is updated more often, Thermal Kit or ChatPDF AI?

Thermal Kit ships an update every 4 months, and ChatPDF AI every 3 months. Most recently, Thermal Kit was updated on October 25, 2026 and ChatPDF AI on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*